diff --git a/rdma/discovery.py b/rdma/discovery.py
index 880cd5a..0806c74 100644
--- a/rdma/discovery.py
+++ b/rdma/discovery.py
@@ -1,5 +1,6 @@
 # Copyright 2011 Obsidian Research Corp. GPLv2, see COPYING.
 import rdma;
+import logging;
 import collections;
 import rdma.path;
 import rdma.satransactor;
@@ -293,7 +294,12 @@ def do_todo(self,old_ctx,bucket,depth):
     def do_port(self,path,node,aport,portIdx,depth):
         """Coroutine to get a :class:`~rdma.IBA.SMPPortInfo` and schedule
         scanning the attached node, if applicable."""
-        pinf = yield self.sched.SubnGet(IBA.SMPPortInfo,path,portIdx);
+        try:
+            pinf = yield self.sched.SubnGet(IBA.SMPPortInfo,path,portIdx)
+        except rdma.RDMAError as e:
+            logging.error(e)
+            pinf = IBA.SMPPortInfo()
+            pinf.portState = IBA.PORT_STATE_DOWN
         aport = self.sbn.get_port_pinf(pinf,path=path,portIdx=portIdx);
 
         if self.lid_route and isinstance(path,rdma.path.IBDRPath):
@@ -319,7 +325,12 @@ def do_port(self,path,node,aport,portIdx,depth):
     def do_node(self,path,depth=0,peer=None):
         """Coroutine to get the :class:`~rdma.IBA.SMPNodeInfo` and scan all the
         port infos."""
-        ninf = yield self.sched.SubnGet(IBA.SMPNodeInfo,path);
+        try:
+            ninf = yield self.sched.SubnGet(IBA.SMPNodeInfo,path);
+        except rdma.RDMAError as err:
+            logging.error(err) 
+            return
+
         node,port = self.sbn.get_node_ninf(ninf,path);
 
         if isinstance(node,rdma.subnet.Switch):